doubt的用法I doubt____she will change her mind for she often be

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doubt的用法
I doubt____she will change her mind for she often behaves strangely.
这一题我觉得应该是选that,答案却是whether,为啥?
啥时改用that,啥时用whether,在意思上有区别么?
还有doubt和suspect的区别是啥?

doubt的准确意思是“对.表示疑惑”,在肯定句中常与if或whether搭配使用,意思是“我对xxxx是否发生表示疑惑”,“我对xxxx是对的还是错的表示疑惑”等等.
而用doubt that时,后面要接的是将要发生或已经发生的一个事实,表示我对这件事的怀疑.而且doubt that通常用在否定句里,表示“恐怕、不会”的意思.用于肯定句的话,还是doubt if/whether更符合习惯.
I doubt if she will change her mind.意思是我怀疑她是不是真的会改变想法.
I doubt that she will change her mind.意思是我恐怕她不会改变想法.
又例如：
I doubt if/whether he will win.我怀疑他能否赢.
I don't doubt that he will win.我不怀疑他会赢.
doubt和suspect的意思上差不多.
doubt更口语化.
suspect更书面化、正规化,而且一般就直接写suspect sth,没有suspect if/whether这样的搭配.suspect that 倒是比较常用,比如：
I suspect that she told a lie. 我怀疑她说谎.
作为对比,I doubt that she told a lie意思是我觉得她没说谎,不过貌似一般比较少这么说.
基本上,我能想到的就这些了.

She will not change her mind.I will not change my mind,eithe I think she will change her mind tomorrow.什么意思 1.I don't like her.She（） change her mind. 1.I have no doubt in my mind _____ they will be glad to see ( )I have no doubt in my mind ____they will be glad to see m I expect she will have changed her mind by tomorrow.的汉语意思 I think Alan won't change his mind.He will be sorry.改为if引导的句 She loving,I will be to stay with her for ages.这句话有没有语法错误, Everything will change, her promise never change and will be I will be here when you change your mind just take your swee I will be change of I Will Change For You